Tracing device for the pirns of pirn winding machines



Dec. 23, 1952 s. FU'RST 2,622,809

TRACING DEVICE FOR THE PIRNS OF PIRN WINDING MACHINES Filed Nov. l, 1949 IN VEN TOR.

STEFAN was: BY

ATTORNEKS- Patented Dec. 23, 1952 @FFEQE 'IEACING DEVICE FOR THE PIRNS OFPIRN WINDING MACHINES Stefan Fiirst, Munchen-Gladbach, Germany, assignor to Walter Reiners, Waldniel/Niederrhein, Germany Application November 18, 1949, Serial No. 128,129 In Germany July 16, 1949 3 Claims. 1

The present invention relates to bobbin or pirn winding machines and is particularly directed to novel means for the control of the proper bobbin diameter and for the correct and continuous forward feeding of the thread guiding means.

It has been known to provide pirn winding machines with pirn controlling or tracing means which, after a predetermined diameter has been reached, effect the forward feeding of the thread guiding means. There are two fundamentally different types of controlling or tracing means used for the purpose in question, viz:

(1) Means, in which a tracer wheel is driven through fric nal co tact with the ut r c umference of the pirn and th n transform h. driving force, either directly or indirectly into a feed movement for the thread guiding means;

(2) Means, in which the tracer wheel is merely in rolling Contact with the circumference of the pirn and then, through pressure created by the tracer means, causes the longitudinal displacement of the tracer means.

It is the second type of construction that this invention concerns. It is true that already a number of tracing devices are known in which the pressure exerted by the tracing means is passed on by various transmitting members to coupling or feed mechanisms which are stationarily arranged at the winding apparatus. However, these coupling or feed mechanisms have the disadvantage that their construction is too complicated and expensive and that their proper functioning is easily disturbed by dust. More-. over, the feed movements obtained with the aid of these known devices are not of the uniform and continuous kind, but more or less of an abrupt and stepwise type, which considerably interferes with the smooth and uniform structure of the porn.

These drawbacks are overcome by the. device disclosed in the present invention.

The herein described pirn tracing device for pirn winding machines is provided with a tracer wheel which is rolling on the circumference of the pirn and which, through pressure created by the tracer means causes the longitudinal displacement of the tracer means. The tracing device has a supporting member with a housing arranged around a constantly rotating screw spindle and equipped with an operating and controlling member actuable by the tracing pressure of a tracer member. Coupling means are arranged in the housing and adapted to be actuated by the operating and controlling member, and the operating and controlling member and coupling means are combined with the thread guiding means and mounted on the screw spindle for joint displacement on the latter parallel to the axis of the pirn. A threaded nut is mounted on the screw spindle within the housing to effect the just mentioned displacement when acted upon by the coupling means. The coupling means may be devised in a variety of ways. In a preferred embodiment of the invention the coupling means consist of a pair of cylindrical casings resting against each other with slanting slide surfaces. According to another type of construction the coupling is elTected with the aid of obliquely disposed supporting or coupling pins secured at the rotating screw spindle in recesses provided in a cylindrical casing and in the operating and controlling member.

In the accompanying drawings, which form a part of this application, I have illustrated, partly in section, two preferred embodiments of my invention. However, it is to be understood that the invention is not confined to any strict conformity with the showing of the drawings, but may be changed or modified, so long as such changes or modifications mark no material departure from the salient features of the invention expressed in the appending claims.

In the drawings, in which similar numerals of reference indicate corresponding parts in all of the several figures,

Fig. 1 is a front view of the guiding and tracing means;

Fig. 2 is a side view, partly in section, of a preferred embodiment of the thread guiding and tracing means;

Fig. 3 is a side View, partly in section, of a modified form of construction of the thread guiding and tracing means.

Fig. 4 is a cross section or" the device shown in Fig. 3, the plane of section being indicated in Fig. 3 at IVTIV.

Referring now to the drawings in detail, the reference numeral I (Fig. 2) denotes the support to which the housing 2 is secured. Arranged within the housing 2 is a casing 3, which is fastened to housing 2 by a screw 3. (lasing 3 has slanted edges which engage respective slanted edges 6 of another casing Casing F5 is pro- 'vided with an arm A constantly rotating screw spindle l, driven in known manner by the winding apparatus, extends freely through the parts i, 3 and 5. Rotatably attached to the arm a is a tracer wheel 8 designed for tracing a pirn 2. The thread F is guided by mean of a thread guiding member ill and wound onto the pirn 9 driven by the winding apparatus. The tracer wheel 8 is in constant rolling contact with the surface of the pirn 9.

In the modification illustrated in Figs. 3 and 4 obliquely disposed pins I2 and I3 are substituted for the inclined edge portions 6. The pins I2 and I3 are secured with their end-portions in the recesses I l provided in the casing 3 and. in the arm 4. Dropping of the pins I2 and I3 out of the recesses I4 through rotation of the arm 4 in anti-clockwise direction is prevented by the provision of a stop for the arm 4. This stop is formed by an edge I6 at the opening in the housing 2.

In both embodiments a threaded nut I5 is arranged between the back wall of the housing 2 and the arm 4.

When the diameter of the pirn 9 increases, the tracer wheel 8 rolling on its surface is displaced in the direction indicated by the arrow I I. In the embodiment of Fig. 2, this displacement results in a corresponding displacement of the arm 4 and of the casing 5 toward the left, whereby the inclined edges 6 of the casing 5 are caused to slide down on the inclined edges of the casing 3. In the embodiment of Fig. 3, a displacement toward the left of the arm 4 is caused by the pins I2 and i3 trying to assume an upright position. But a movement toward the left of the arm 4 results in clamping of the threaded nut I5 between the arm 4 and the back wall of the housing 2, and the clamping thus effected then causes a longitudinal displacement of the nut on the constantly rotating screw spindle 1. Moreover, as the nut I5 during that clamping is bearing against the back wall of the housing 2 and the support I, the displacement of the nut on the screw spindle causes a simultaneous displacement of the entire thread guiding means, including the thread guiding member I which is likewise secured to the support I. Through this longitudinal displacement, the pressure between the tracer wheel 8 and the pirn 9 is relieved, so that the threaded nut I is enabled to freely rotate between the arm d and the back wall of the housing 2 until, through another increase in the diameter of the pirn, another clamping and another forward feeding of the nut is effected.

As the aforesaid rotation of the nut I5 already takes place at the slightest slackening in pressure, and as the clamping of the nut is already eifected at the slightest increase in pressure, it is obvious that the displacement of the tracer wheel 8 in the direction of the arrow II will also be only a very small one. Under favorable conditions the displacement of the tracer wheel amounts to only a few percent of a millimeter. Therefore, a very accurate tracing of the outer diameter of the pirn is possible. Moreover, the highly sensitive construction of the device permits a stepwise feed movement which as such is not recognizable to the eye. The clamping of the nut l5 takes place at such short intervals and distances that it may be regarded essentially as a continuous and uninterrupted feed movement.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a tracing device for pirn winding machines the combination with suitable thread guiding means and means for accommodating a pirn to be wound, of a housing connected to said thread guiding means; a constantly rotating screw spindle extending through said thread guiding means and said housing parallel to the pirn; a threaded nut mounted on said spindle within said housing adjacent the back wall thereof for rotation with said spindle; an operating member loosely rotatable on said spindle within said housing adjacent said nut; said housing having an opening; said rotatable operating member having an arm extending through said openin toward the pirn; a tracer wheel rotatably secured to the free end of said arm and capable of rolling contact with the circumference of the pirn; and coupling means having two axially aligned coupling members disposed on said spindle, one of said coupling members being rigidly joined with said operating member and said other coupling member being rigidly joined with said housing, said coupling means having oblique coupling elements for coupling said two coupling members with each other so as to force said operating member against said nut and said nut against said housing whenever said tracer wheel through the pressure exerted against it by the growing circumference of the pirn causes a rotatory displacement of said operating member, whereby a longitudinal displacement of said nut, housing and thread guiding means on said spindle is effected.

2. In a tracing device for pirn winding machines the combination with suitable thread guiding means and means for accommodating a pirn to be wound, of a cylindrical housing connected to and projecting from said thread guiding means, said housing having a wall adjacent said thread guiding means and having a cylindrical opening opposite said wall; a constantly rotating screw spindle extending through said thread guiding means and through the center of said housing and opening so as to be parallel to the pirn; a threaded nut mounted on said spindle within said housing adjacent said wall for rotation with said spindle; a hollow cylindrical casing rigidly secured in said cylindrical opening and loosely surrounding said spindle, said casing extending with one of its ends into said housing and being provided at that end with a plurality of tooth-like projections of slanting conformation; an operating member loosely rotatable on said spindle within said housing adjacent said nut; said housing having a lateral opening and said operating member having an arm extending through said lateral opening toward the pirn; a tracer wheel rotatably secured to the free end of said arm for rolling contact with the circumference of the pirn; and a cylindrical coupling member loosely surrounding said spindle within said housing and having one end rigidly secured to said operating member for rotation together therewith, said coupling member having at its other end a plurality of toothlike projections substantially matching said projections of said casing for coupling engagement therewith, and said coupling member being adapted to slidingly bear with its tooth-like projections against said slanting projections of said casing to thereby force said operating member against said rotating nut and to thus press said rotating nut against housing wall whenever said tracer wheel, through pressure exerted against it by the growing circumference of the pirn, causes a rotatory displacement of said operating member through said operating arm, whereby a longitudinal displacement of said nut and housing and thread guiding means on said spindle is effected.

3. In a tracing device for pirn winding machines the combination with suitable thread guiding means and means for accommodatin the pirn to be wound, of a cylindrical housing connected to and projecting from said thread guiding means, said housing having a wall adjacent said thread guiding means and having a cylindrical opening opposite said wall; a constantly rotating screw spindle extending parallel to the pirn through said thread guiding means and through the center of said housing and opening a threaded nut mounted on said spindle within said housing adjacent said wall for rotation with said spindle; a hollow cylindrical casing loosely surrounding said spindle and rigidly secured to said housing and disposed in said cylindrical opening, said hollow cylindrical casing being provided in the cylindrical wall facing the interior of said housing with a plurality of recesses; an operating member loosely rotatable on said spindle within said housing adjacent said nut; said housing having a lateral opening and said operating member having an arm extending through said lateral opening toward the pirn; a tracer wheel rotatably secured to the free end of said operating arm for rolling contact with the circumference of the pirn; a, 25 1,014,981

plurality of recesses in the side wall of said operating member facing the interior of said housing; and a plurality of coupling pins obliquely arranged between said cylindrical casing and said operating member and having their two ends in loose engagement with respective ends of said recesses of said cylindrical casing and said operating member for forcing said operating member against said nut and said nut against said housing wall whenever said tracer wheel, through pressure exerted against it by the growing circumference of the pirn being wound, causes a rotatory displacement of said operating member whereby a longitudinal displacement of said nut and housing and thread guiding means on said spindle is effected.

STEFAN FURST.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Sykes Jan. 16, 1912 Number 

